Add pytest-subtests to dev requirements
This pytest plugin adds support for unittest's TestCase.subTest (for
Python >= 3.4). Since we we now only support python3 and since we use a
fair amount of these, let's benefit of better reporting by using this
plugin.
version=3
opts=uversionmangle=s/(rc|a|b|c)/~$1/ \
https://pypi.debian.net/cubicweb/cubicweb-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))